Yes-mine lies constantly as well. Some of it is definitely a distorted sense of reality and some is manipulation. And she will stick to her lies even when confronted with overwhelming proof to the contrary. She lies with such conviction . And it is fruitless to argue with her. She will never back down or admit it. It only escalates into anger. I don't trust her or believe anything she says anymore. Sad, but true.
One of her favorite lies is that she says that her therapist has told her that all of her problems are my fault. That I don't give her the things and support she needs to get better. Rather than present her evidence to the contrary, I don't argue with her. I just say "OK, why don't you make an appointment with him for you and me to go in together and discuss this". Of course she will never do that because she made it up to manipulate me and deflect responsibility from herself. Or she will lie and I will respond. "Well, I know that is not true but Im not going to engage with you today". This approach works so much better than confronting her and gives me more peace. She knows that I have her number. Will this keep it from happening again, absolutely not! But it is how I can handle her. I have given up ever being able to trust her or ever having any sort of normal relationship with her. But this detached approach is so much healthier for me.